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Mech. Vent
Mechanical Ventilation - Unit 2 SPC
| Question | Answer |
|---|---|
| What is responsive Hypoxemia? | Significant response to increase FIO2. Due to V/Q mismatch. A 20% increase in FIO2 = 10mmHg increase in PaO2 |
| What is refractory Hypoxemia? | No increase in PaO2 with increase in FIO2. Due to combo of anatomic and capillary SHUNT |
| What is Deadspace? | Ventilation w/o Perfusion = High V/Q. From Pulmonary Embolism |
| What is Pulmonary/Capillary Shunt? | Perfusion w/o Ventilation = Low V/Q. From ARDS, pneumonia, atelectasis. |
| Normal V/Q? | they should match = 1.0 but normal is 0.8 |
| PaO2/FIO2 (PF) ratio | lower is worse. <300 = acute lung injury, <200 = ARDS |
| Normal PaO2/FIO2 (PF) ratio | 400 |
| Calculate Minute Ventilation | RR X Vt(Tidal V) |
| Calulate VD/VT | (PACO - PECO)/PACO, Normal VD/VT = .30, pt w/Puml. Embolis have higher ratios |
| Calculate Effective Minute Ventilation | VA = (1-VD/VT) x RR x Vt |
| Calculate Static Compliance | Remember Stat = Plat, Vt/(Plat - PEEP if any) |
| Normal Static values | 0.05-0.17 L/cmH2O or 50-170ml/cmH2O |
| Static measures what? | Lung Compliance w/o airflow |
| Calculate Dynamic Compliance | Vt/(Peak - PEEP if any) |
| Dynamic measures what? | Airway resistance during airflow |
| Static Compliance is altered by | changes in Lung and Thorcic compliance |
| Dynamic Compliance is altered by | Lung, Thoracic AND AIRWAY Resistance |
| Calculate Airway Resistance | Peak-Plat pressure/Flow |
| Normal Airway Resistance Value | 1-2 cmH2O/L/sec, Athsma and Emphysema is 13-18 |
| Tissue Resistance | caused by non elastic tissues in contact with Respiratory Tract, i.e. great blood vessels, certain muscles, and some upper ab contents |
| Name the 3 Deadspaces | Anatomical, Alveolar, Mechanical |
| Anatomical Deadspace | Conducting Airways |
| Mechanical Deadspace | Re-breathed gas from Mechanical attachments |
| Alveolar Deadspace | Gas not reaching functioning gas exchange units |
| What alters THORACIC Compliance | Shit that affects the chest wall, Kyphoscoliosis, Pectus Excavatum, Ascites, Obesity, Chest Strapping, Diaphragmic impairment |
| Factor that alter LUNG, THORACIC, STATIC, and DYNAMIC Compliance | Congestion(CHF, Pulmonary Edema), Atelectasis, Fibrosis, Emphysema, Pneumonia |
| Relationship between PACO2 and pH | When starting at PACO2 of 40, for every 20 increase, the pH decreases .10, ... for every PACO2 decrease of 10, pH increases by .10 |
| Changes in BiCarb caused by PACO2 | for every 10 increase in PACO2, HCO3 increases 1,...for every 10 decrease in PACO2, HCO3 decreases 1.5 |
| 30 is 60, 60 is 90, and 40 is 75 | If PO2 = 30 sat is 60, 60 is 90, and 40 is 75(VENOUS) |
| If suction cath meets resistance... | get tube with smaller diameter. |
Created by:
mac6672
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